I'm reading Marko Kloos's Angles Of Attack. You should, too.
While mil-SF is not one of my major interests, I've read Elizabeth Moon's "Ensign Suiza" and "Vatta's War" series, Starship Troopers and the various mil-ish C. J. Cherrryh novels (notably Rimrunners and Tripoint) and David Drake's Leary and Mundy series. Marko's series is as good as any of them.